Barcelona is a large city, the second largest in Spain, with a population of over 1.6 million people. While it’s got an historic heart containing many of the things any visitor to the city will want to see, there are other attractions dotted further afield that you’ll want to visit, such as Barcelona FC Stadium, Gaudi’s Parc Guell and Montjuic (which is accessed by funicular railway). The historic center of the city itself is best negotiated on foot. It’s flat and many of the streets are either pedestrianized or very narrow for traffic. By walking, you’ll discover places and see sights you never would if you were whisking past in a taxi or on a bus. For example, to get to the beach you can catch the metro that stops in Barceloneta, or walk for about 20 minutes from Las Ramblas in the center of town. Along the way you’d see one of the world’s best food markets, tons of stores, and countless people walking or performing in the street.
If you don’t like walking or want to venture a bit further from the center, then the Metro system is the perfect tool.